Question: When Otto von Bismarck ended as Bundeskanzler (Norddeutscher Bund) ?
Paraphrase: On what date did Otto von Bismarck quit as Federal Chancellor?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q8442 p:P39 ?s . ?s ps:P39 wd:Q885840 . ?s pq:P582 ?value}